/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.runners.core;



import com.bff.gaia.unified.sdk.annotations.Experimental;

import com.bff.gaia.unified.sdk.annotations.Experimental.Kind;

import com.bff.gaia.unified.sdk.transforms.DoFn;



import java.io.Serializable;



/**

 * A factory for providing {@link StateInternals} for a particular key.

 *

 * <p>Because it will generally be embedded in a {@link DoFn DoFn},

 * albeit at execution time, it is marked {@link Serializable}.

 */

@Experimental(Kind.STATE)

public interface StateInternalsFactory<K> {



  /** Returns {@link StateInternals} for the provided key. */

  StateInternals stateInternalsForKey(K key);

}